Engine for drilling-machines



M. .I..BUHKEL AND P. B. WEIS.

ENGINE FOR DRILLING MACHINES.

APPLICATION FILED MAY I7. I9I6.

M. l. BURKEL AND P. B. WEIS.

ENGINE FOR DRILLING MACHINES. APPLICATION FILED MAY I7. I9Ie.

Patented Feb. 22, 1921.`

5 SHEETS-SHEET 2- M. J. BURKEL AND P. B. WEIS.

ENGINE FOR DRILLING MACHINES.

' APPLICATION FILED MAY I7. |916. 1,369,082.v

WM M

1M. 1. BuRKELA-Nn P4B. wElS. 'ENGINE FoRpmLuNG MACHINES.

APPLICATION HLD MAY 17,- 1916-'.

Pateted Feb. 22', 1921.

11.i,369,`o82.l A

.7 y faz. 1y@

' l l faul/15%@ M. I. BU-HKEL AND P.' B. W'EIS.

ENGINE FOR DRILLING MACHINES.

APPLICATION FILED MAY II'. 15H6.

UNITED s'rfarlssl PATENT ori-ic1-:-.-v

MATREW zr. RURKEL A,AND PAUL is. wins,` or AURORA, ILLINois, ASSIGNOR'S "T CLARENCE E. iviEHLnorE, ,TRUSTEE or WINNE'rxAyiLLINors ENGiNE FOR iiRrLLiNGfMAcHiNEs.

l Application led May 17, 1916. Seria1.No.p98,017.

T o all whom it may concern.; f

Be it known that` we, lVlArHiiwy J. BERKEL and PAUL B. 'VVEis, citizens of the United States,

`and residents of Aurora, 'in the county of Kane and State oi Illinois, have invented certain new and useful Improvements in Engines for Drilling-Machines; and we` do hereby declare that the followingk eration, as will clearly appear as we proceed with our speciiication.

The improved drilling machine is actuated by means of a duplex, reciprocating, pneumatic niotor, the two pistons oi2 which are operatively connected to drive a crank shaft, which through intermediate gearing is made to drive the tool spindle in either di iection. The motor is reversiblcand-.is connected to the crank shaft so that the latter may be started in either direction. The drilling machine is thus completely reversible and is capable of use where prior close quarter drills may not be used by reason of the fact that they are not reversible.

The many objects and advantages of our 'iin i'oved drilling machine ina be more P e clearly pointed out after we have described its construction in detail and for this reason a description of them will be deferred untillater. n y

Referring now to the drawings: Figure l isa view representing a longitudinal section through our improved drilling machine in a plane indicated by the line if-i of rig. i. y

F ig. 2 is a view representing a transverse` sectional end elevationothe same in aplane indicated vby the line 2-2 ofFig. l.

pneumatic tool is embodied end. of the casin Fig. 3 is a view representing a transverse section through the drilling machine in a Specification of Letters Patent. Patented elL 22 1921. v

plane indicated by the angular line 3-.3 inV Fig. 4 is a View representing a longitudi-i nal section through thedrilliiig machine in a plane at right angles to the section shown in Fig. l, as indicated by the angular line 444 ofFigl. fr.

Fig. is a view representing a longitudiiialsection through the throttle valve which controls the inlet of Huid to the motor of the drilling device.

Fig. 6 is a perspective viewof a valve plug associated witlithe valve chests of the motor cylinders.

Figs. 7, 8 9 and l0 arev views representing longitudinal sections through the cylinders andthe valve chestsin anangular plane 1ndicatedby the line 7-7 of Fig. 3, showing` the relativey positions of the pistons and of theirassociated valves,aswill appear more l clearly in the detailed description following.

Fig. il is a view representinga transverse section through the valve chests in a plane indicated by the line ll--ll of Fig. 8.` i

Figs. 12, 13, i4 and lare diagrammatic."

sectional views indicating thek relative posi-V tions of the pistons of the` motor and'of their respective crank pins in various positionsor" one rcomplete cycle.

soy

Referring now to that embodiment of ourf f invention illustrated in the drawings, 20 indicates a hollow shell or casing which constitutes the body of the drilling machine. This shell is substantially rectangular in cross section as indicated iiiiFigs. 2 vand 3,

but is tapered on two sides toward the spindle end 2l as indicated in Fig. fl. 22 indi- `cates a spindle which has bearing in the g, and, has the familiarv socket 23 to receive the .shank of the'` drill.

yThe. spindle is mounted close to the fend wall 2l oit the casing which ismade concentric with therotary axis of the spindle.

A sleeve 9A fixed in a suitable socketin the bottom "wall of the casing provides rotativebearing for the lower length yoi. the spindle and aradial flange Q5 atthe top of said sleeveprovides a thrust bearinv for a radial shoulder 26v on the` spin e--a washer 27 being interposed between the two. A stuffing box 2S is provided to close the bearing opening inthe shell about the bottoni end of the spindle. The upper end of the spindle has rotative bearing in a socket formed inthe top of the shell and hasthrust bearing against a head, or plug7 29. .Said plug is retained in the shell by means of a ring 30, which is threaded into the top of said socket and surrounds the upper end of the plug.

A jam nut 3l is threaded upon the upper end of the plug to lock the ring 30 in place. As shown, the top of the spindleV is pro#l vided with a bearing aperture or recess into which the bottom end of the plug 29 tends, thus providing a bearing for the top of the spindle. A radial shoulder 32 onl the plug provides an end thrust for the 'top end of the spindle., anti-friction balls being interposed between the two.-

The intermediate length of the spindle 22 is provided with longitudinal teeth 33.

Said teeth are engaged by a worm 3d mounted near the end of the casing with its axis at right angles to the axis of the spindle-` and to the axis of the casing. The said worm is of considerably greater diameter than the gear provided by the teeth 33 on the spindle and the threads of the worm approximate a right angle to the rotative axis of the worm. By this construction a maximum of torque is imparted to the spin dle to drive the tool. As will be manifest the worm and gear may be of multiple or of single thread as required. As shown in the drawings the thread is single. The gear teeth 33 on the spindle are cut inwardly in an arc of the radius of the worm so that-the worm may engage a maximum number of said teeth. f

The side walls of the casing are strengthcned in the vicinity of the spindle by means of vertically extending, internal ribs 21221, which merge or disappear transversely into the curved end wall 21. This construction obviates the necessity for the usual external strengthening rib and, as but little clearance is required between the spindle and the end wall of the casing, it is possible to more closely approach the axis of the spindle to fixed parts in the neighborhood ofthe hole that is to be drilled.

The worm 3e is mounted on a sleeve 35 to which it is keyed and the sleeve in turn is rotatively mounted on a shaft 36 that eX- tends transversely through the casing 20. Said casing is lprovided with suitable openings 37, 40, in its side walls to receive'the shaft, which.r in assembling the drilling machine, is inserted through the opening 37 at one side, its movement therethrough being limited bv means of a head 33. The other end of the shaft, namely the end 39, is reduced and extends through the opening `40,

beyond which it is engaged and locked in place by means of a nut and washer 41. The inside wall of the casing is formed to provide thrust shoulders -12-43 about the shaft 36 and between these and the ends of the sleeve are interposed suitable anti-friction bearing devices i4-fill.' At one end of the sleeve 35 is formed'an integral spur gear d5. -Roller bearings e46-46 are providedv at the ends of the sleeve between said sleeve and the shaft 36.

A second transverse shaft 47 ispmounted in the casing near the first named shaft 36 and in parallel relation thereto. Said shaft has a spur gear f8 made integral with it at one end and is provided with a recess -flQat vthat end, which bears upon a stud 50, extending inwardly from the side wall of the casing. T he stud 50 is formed on a disk 5l, which is fixed in a suitably formed hole7 or opening, 52, inthe casing wall. Said disk has a flange 53 which is spaced inwardly from. its outer face and which engages against the inside wall of the casing about said hole, the outer face of the disk being flush with the outside surface of the side wall of the casing.

On the opposite side ofv the casing is a large hand opening ff-which is closed by a plate 55 screwed to the casing. Said plate is provided with an opening 56 similar to the opening 53 in the opposite side wall 0f the casing and in said opening is engaged a flanged disk 57, which is like the disk 51 except that it has a recessed boss 5S, extending into `the casingto provide a bearing for the end of the shaft 47. Suitable roller bearings 59-59 are provided between the shaft and the bearing stud 50 on the one hand and the recessed bearing boss 58 on the other hand.

A spur gear 6() is fixed on the shaft '17 between an integral radial shoulder 61 and a nut 62 threaded upon the shaft near its end,-the bearing end of the shaft being re duced in diameter to permit said nut to be slipped beyond it. Said spur gear engages the spur gear l5 which, as has been described, is non-rotatively connected to the worm 34e. 4

Near the shaft 47 and arranged parallel thereto and in plane of the shafts 37 and e7; there is mounted a crank shaft 63. T he bearing ends of said shaft are formed to provide spur gears 6e 6e which are made coaxial with the rotative axis of the crank shaft. Said gears have bearing recesses 65 on their outer faces, which are engaged by studs `66 66, fixed in the sidewalls of the casing. The studs 66, 66, are made integral with flanged disks 67, 67, one of which is engaged in an aperture 68 in the side wall of the casing and the other of which is engaged in an aperture 69 inthe plate 57 that closes the hand hole on the opposite side of the casing. Said disksvare similar in con. struction and 1n manner of engagement with 1n thelr respective openings to the d1sk51 yalready described.

The gear 64 on the crank shaft 63 adjacent the side of the casing opposite the hand hole engages the gear 48V on the shaft 47.

Thersecond gear 64a on said crank shaft is parts rotative movement to the shaft 47,V

which in turn through the gears 60 and 45 imparts rotative movement to the worm so as to drive the spindle. j v

The bottom wall of the casing has a hand hole which is closed by a plate 20 (See Figs. 1, 2 and This hole provides for the inspection of the gearing in the casing, after it has been assembled, and also for packing the casing with grease.

The crank shaft is driven by means of a two cylinder reciprocating pneumatic motor or engine which is mounted in the rear end of the casing 20. The cylinders of the engine are made integral with the Vcasing and are arranged in planes extending at an acute angle to each other and intersecting in the rotative axis of the crank shaft as shown in Fig. 1. -71 indicate thecylinders vand 72-73 their'associated valve chests. As the construction of the two are similar, ade# scription of one kwill suffice, the like parts of the two cylinders and of their valve mechanisms being indicated by like numerals.

rThe body of the cylinder 71 is provided by a tubular shell 74 made as stated, integral with the casing 20. The outer end 75 of said shell is oflarger diameter than its inner end and contains a sleeve 76 in which the piston 77V has reciprocatory bearing. Said sleeve is'held in' place by means of a threaded plug 7 8, that is screwed into the outer end of the shell 7 5` and forms the head of the cylinder. 79 indicates a cross head which has reciprocatory bearing in the smaller part of the shell. An apertured plug 8O closes the inner end of the cylinder proper, the same being engaged between the inner end of the sleeve 76 and the annular' shoulder 81 formed in the shell where the two parts of different diametermeet.

82 indicates'the piston rod which has a pivotal connection 83 with the cross head 7 9 and which reciprocates through the aperture inthe plug Vin the usual manner. 84 indicates a connecting rod and 85, a crank pinv on the crank shaf-twhich is connected by said rod to the cross head 79. 86 indicates the other crank pin of thecrank shaft, which is connected by a like connecting rod84 to the piston rod of the other cylinder. The two crank pins 85-86`are separated from each other by an angle of 180o.

Referring now tothe valve chest 73 asso-v ciated with the cylinder 71, the body of this valve chest is formed byy a tubular shell made integral with the casing as in the case of the cylinder, said body containing a bushing 87V in which a piston'valve plug 88 is longitudinally 'reciprocable The outer end of the valve chest is closed by means of a threaded cap 89. vA link 90 connectsthe valve plug to an eccentric 92 fixed to the crank shaft'in a position intermediate the i two crank pins 85 and 86. The axes ofthe eccentrics` are diametrically vopposite each otherand are arranged yin a plane extend; ing at a right angle to the plane of the axes y of the crank pins. as clearly shown in Figs. 7 tol() inclusive.

In the plane of and between the two valve i chests 72-73 thereis iXedin the casing 20 a ported plug 93. (See Figs. 3, 7 and 8).

94, 95 indicate ports extending transverselyy through said valve plug and opening respectively into the outer and inner ends of eachv valve chamber. Y Said ports communicate with a longitudinal passage 97 in the plug 93. 96 indicates a port opening into each valve chamber half way between the ports 94 and 95. Said ports are connected by an annular groove 98 inthe plug 93 (see Figs. k5 and 7) with a longitudinal passage 99 in said plug. When the drilling machine is running in one direction the passage 97 and the ports 94 andy 95 constitute an inlet passage andinv let ports while'tlie ports 96 and the passa ge 99 constitute exhaust ports and an exhaust passage. When the machine is reversed, the

functions of these ports and passages are reversed.

. The valve plug 88 has parts .100, 101, cf full. diameter at its ends and also a like part lOQabout midway of its length. Between said parts the plug is of reduced diameter to provide annular spaces 104, 106, 107 indicate ports connecting the ends of the cylinder with the valve chamber. n In the reciprocation vof the valve plug the said` ports are made'hy the annular spaces 104. 105 to connect thecylinder on one side of the piston with/one or the other ofthe inlet ports andvat the same time to connect the cylinder onthe other side of the piston with the exhaust port, so as'to produce a reciprocation of the piston in a familiar manner, as may be readily seen by an examination of Figs. 7 and 8.

At the end of the casing in axial alinement with the plug 93 is provided a tubular, cX-

ternallytlireaded boss 110 which receives the inner end of a throttle yvalve plug 111; Said plug has a radial shoulder 112 near its end which abuts against the end of the boss 110 13o and Which is held engaged therewith by al` union nut 1155` screwed upon the end ot said hess. Beyond the shoulder 112 the plug is tapered, as indicated at 11-1-, toivard the main body ot the plug; 111, which is reduced in diameter. rl`hehe1"ore mentioned inlet ei:- haust passages 97 and 99 are extender through the inner end ot the valve plug and open through the tapered part 1,1-1 thereolf. 123 indicates longitudinal passageway extending` ironi the front end ot the plug and opening at its rear end through the tapered. part of the plug` at a point toruuird o1 the open ends oi? the passages 97 99.

115 indicates a hushii or sleeve inonn' .al on the throttle valve plug` 1li.. saidhusliingg constitu yingu the movable part oit' the throtte valve, Said hashing` is termed its inner end to seat upon the tapered part 11a o' the plug and is retained in place hy nieans el a nipple 110 threaded into the end of the plug` in a familiar inanr -r. rllhe hashing is chanihored at its end to receive a coiled spring` 117 which acts lieti-.veen a tired part of the sleeve and the bushing` in snug` seaV the tapered part el ln the bushing' 115 the tapered part ot the plug ay bridging port 11S which is adapted to he hrought into position to coininnnicate either with the pas sage 97 or With the passage 99, and to connect either the ortie other of these passages with the inain inlet passage 1A l) depending upon vvhiea one oit these passages is acting` as an inlet pas 'ewthat is to s Whether the niotor is ruin in one direction or in the reverse direct on.

rlhe lnishing` 115 terminates short of the union nut 113 to leave an exhaust space 121. 119-120 indicate ports inthe end of the bushing 115 (see Figs. 2 and 5) which open into the space 121. rllhe port 119 may he brought into communication with the passage 99 or the port 120 may he brought into communication With the passage 97. lhus these ports provide nieans for connecting either the passage 97 or the passage 99 with the exhaust space 121. An air exhaust, detlecting ring 122 oi? familiar construction connected in the usual manner to the union nut so as to inclose the space 121.

rlhus as will he manifest, hy a part turn of the hashing 115 on the throttle valve plug 111, the inlet passage may he brought by means or" the bridging port 11S into connection either with the 97 or with passage 99, the passage not thus connected being at the saine tiine connected by one or the other of the ports 119,120 with the ei;- haust space 121. rlhe inlet and exhaust passages to the motor hy this ineens may he changed so as te reverse the engine. Snitahle stops (not shown) are provided for limitino the rotative movement ot the valve bushing 115 4and to stop it in either of the positions described. f

*Referring nonT to the operationv of the motor:

ln Figs. 12 to 15 inclusive, the relative trations it Will he apparent? thatg on account oif the angular relation or" the tivo cylinders (70, 71), the pistons will never be on dea-d terr at the saine time, notwithstandina` A,ie tact that the tvfo crank pins are separated hy an angle ot 1o00.

rThus in Vllig. 12, the crank pin 96 and the piston or. the cylinder 70 are at dead center, while the cranlr pin 65 and the piston o'li the cyliinler 71 have just reached andpassed somewhat beyond dead center. ln l? 14. with each ot the pistons at or near the other ends ot its stroke, the crank iin 86 and the piston in the cylinder 70 are aliproaching dead center, Whereas the cranlpin and its piston in the cylinoer Flare at dead enter. rlhus no matter in what position ot the crank shaft the motor stops, admission ot the pneumatic fluid ly the throttle vali/'e to drive the will he effective to operate the inotor.

ln Figs. 7 and 8, the pistons el the two cylinders and the valve plugs ot their associatedvalve chests are shown in two ditterent positions. The throttle valve hushing 115 is shown in said ligures adjusted to connect (by means of the bridging port 118) the main inlet passage 123 in the throt- :le valve With the passage 97 in the intermediary plug 93. The passage 97 is thus in this case the inlet passage for the motor, While the passage 99 is the exhaust passage. The arrows indicate the direction in Which the pistons and valves are moving.

ln Fig. 7 the piston in the cylinder 70 is approaching the outer end of its stroke and the valve plug` inthe associated valve chest is in a position still connecting the cylinder port 106 on the inner side of the piston With the inlet port 95, and the cylinde port 107 on the outer side of the piston with the exhaust port 96. The piston in the cylinder 71 on the otherhand has reached the end of its stroke and the valve plug in the associated valve chest has closed both of the cylinder ports (106, 107

ln Fig. 8 the piston in the cylinder 70 is moving toward the inner end of its stroke and the valveplug in the associated valve chest is in a position connecting;r the cylinder port 107 at the outer end of the cylport 94, and the cylininder with the inlet der port 106 at the inner Vend of the cylin-f pistons in either. direction,

ing is'shown adjusted to connect (by means A of the bridging port 11S) the main inlet passage 123 of the throttle valve to the passage 99, which in Figs. 7 and 8 was the exhaust passage, but upon the'reversal of the motor,

vnow constitutes the inlet passage. The passage 97 (formerly the inlet passage) is now the exhaust passage; -lVith the exception of the reversal of the function ofV these two .passages- 97,99the operation and connections are the same upon reversal of the motor as that heretofore describedland will be apparent from an examination of Figs. 9y and 10, without further description.

Th'emany advantages vof the improved drilling machine willbe manifest from the foregoing description, to those familiar with the art. l y v As has been pointed out, the useof the worm of large diameter in connection with the gear on the spindle of comparatively smaller diameter, together with the arrangement of the teeth of the worniand of the gear so that the former extend nearly `at right angles to the axis of the Worm, pro vides for a very powerfull drive and raises the efliciency of the drillingfr machine to a maximum. Byi'the use` of the `worin drive also, the spindle may be effectively operated in either direction yandthis,.in combination `with-the reversible motor'operating as described, makes it possible for the drilling machine to be used not only as a close quarter drill but for tapping, reaming and alloperations of the kind where a reverse drive vof the spindle is required. Thus, the'improved drilling machine may be used as a universal tool. l

Another and primary advantage of the improved drilling machine results from the fact that the several gears in the casing may be easily and readily changed to suit different requirements without change of the casing or body ofthe tool.y Thus, where as now in the manufacture of pneumatic tools, it is necessary to have ay great `many different patterns, jigs, diesand special tools to manufacture the many different drills necessary to satisfythe many uses to which such drills are'put, in the case of the present drilling Vmachine it will be requiredto have onlyy equipment to make a comparatively limited numberV of casings or bodies to suit several different varieties oftapers ofthe tool shank and the various speeds required .in the many different uses ofthe ple changes yof the `gearing in one or the or casings.

Thus, inthe case of the drillbody illustinted, tofurther increase the speed of the tool spindlc,,it would simply be necessary to substitute aworm with a multiplethread instead ofthe single thread shown therein and change the spindle to one having teeth to be engaged by said worm. Again, the

speed of the spindle for the same body may bevaried by changes in the gears 45 and 60. Thus the varied requirements that might be met in a single body will be apparent; to those familiar with the art. The enormous saving in the expense of equipment required to manufacture a full line of drills to meet all? situations in the case of the improved drilling` machine will therefore be readily understood. i

i By reason of the factthat the wormteeth are substantially at right angles to theaxis of the worm it will be manifest that the drill may be used as a wrenchor extractor for removing the tool from the hole cut after` the tool has been driven as far as desired;

It will be noted that the body or casing f and tlieplates and parts `connected thereto are all made insuch manner that a smooth bodyis presented for the grip of the work- -mair Thus, shoulders and` sharp ,edges which areso objectionable in tools of this type, as at present constructed, are entirely eliminated; "3

lVhile in describing our invention, we

f have referred to various details of construction and arrangement, it is to be understoodr Y that the invention is to be in no Way limited thereto, except as may be pointed out in the appendedclaims. i

We claim "as ourinvention:v n

l. ln a drilling machine in combination with a casing, ra spindle mounted in vone end of said easing, a crank shaft rotativelyq mountedv in said casing and extendingat right angles to saidyspindle, gearing intermediate said crank shaft and said spindle Vfor driving the` spindle in either direction,

a two-cylinder motor unit, each cylinder *having a pistonreciprocating. therein' andl connected to said crank shaft, the two cylwhich intersect at' an acute angle in the vtools may be readily accommodated by sim- `other of the said Alimited number of bodies f `inders being located in two differentplanes said crank shaft having two diametricallyf opposite crank pins each operatively connected to one of said pistons. y

' i2. In a 4drilling machine in combination with'a casing, a spindle mounted in one end ofy said casing, a crank `shaft rotativ'ely mounted in said casingl and extending at right angles tosaid spindle, gearing intervmediate said crank shaft and said spindle fordriving the` spindle'in either direction,

a two-cylinder motor unit, each cylinder having a piston reciprocating therein and connected to said crank shaft, the two cylinders being located in two di'erent planes which intersect at an acute angle in the transverse median plane of said casing, said crank shaft having two diametrically opposite crank pins, each operatively connected to one ot' said pistons, and means for admitting a pneumatic Huid to said cylinders including a reverse valve whereby the crank shaft may be driven in either direction.

3. ln a drilling machine in combination with a casing, a spindle mounted in one end of said casing, a crank shaft rotatively mounted in said casing and extending at right angles to said spindle, gearing intermediate said crank shaft and said spindle tor driving t-he spindle in either direction, a two-cylinder motor unit, each cylinder having a piston reciprocating therein and connected to said crank shaft, the two cylinders being located in two different planes which intersect at an acute angle in the transverse median plane of said casing, said crank shaft having two diametrically opposite crank pins each operatively connected to an associated piston, valve chests and valves associated with said cylinders, an intermediary valve plug provided with anfinlet and exhaust passage adapted to be connected by said valves with said cylinders, and a throttle valve connected to said intermediary plug and provided with an inlet port and an exhaust port, said throttle valve having a movable member adapted to connect either oi the passages in said int-ermediary plug in alternation with the inlet port and exhaust port respectively.

4. 'A. drilling machine comprising an elongated casing having apair of cylinder bores in one end which are located in diiferent planes and which extend at an acute angle to each other to intersect in a transverse line between the ends of said casing, said casing end also having a pair of valve chest bores extending parallel to said cylinder bores, one for each cylinderbore, said associated cylinder bore and valve chest bore having communicating passageways, there also being passageways which connect said valve chest bores together, pistons and piston valves in said cylinder bores and valve chest bores respectively. a crank shaft journaled in said casing with its axis parallel to said transverse line, and operatively connected to said pistons and piston valves, a spindle journaled in the other end of the casing and operatively driven from said crank shaft, a valve plug located in the passageway connecting` said valve chest bores, said valve plug having' an inlet passageway and an exhaust passageway which communicate with the passageways connecting said valve chest bores,V and a valve ,Sleeve associated with the said valve plug for controlling the admission of an operating fluid into and out ofsaid passageways in said valve plug.`

5. A drilling machine comprising an elongated casing having a pair of cylinder bores in one end which are located in different planes and which extend at acute angles to each other to intersect in a transverse line between the end of said casing,

said casina' end also havine` a air of valve in a:

chest bores which extend parallel to said cylinder bores, one'for each cylinder bore, said associated cylinder bore and' valve chest bore having communicating passageways, there also being passageways which connect said valve chest bores together, pistons and piston vvalves in said cylinder bores and vvalve chest bores respectively, a crankshaft journaled in said casing with its axis parallel to said transverse line, and operatively connected to said pistons and piston valves, ya spindle journaled in the other end of the casing and operatively driven from said crank shaft, a valve plug located in the passageways connecting said valve chest bores, said valve plug having an inlet yand an exhaust passageway connecting said valve chest bores, anda. valve sleeve having inlet and exhaust ports adapted to be brought into register with the passageways in said valve plug, said valve sleeve being capable of rotation to reverse the proximate register of its ports with the ports in said valve plug. A Y

G. ln a drilling rmachine in combination with a casing, aspindle mounted in one end oic thecasing, an engine comprising a pair of cylinders in the other end of said casing, said cylinders being located in two diilerent planes which intersect at an acute angle in a line at right angles to the a-Xes of the spindle, a valve chest parallel withV and associated with each cylinder, a piston in each cylinder and a valve reciprocable in each valve chest, a crank shaft mounted in the casing with its axis parallel to the line in which the planes of the cylinders intersect, said crank shaft having oppositely disposed Vcrank pins and oppositely disposed eccentrics.` the diameters of which are arranged at right angles to the diameter of said crank pins, each crank pin being operatively connected to and associated with one of said pistons and each eccentric being operatively connected to and associated with one of said reciprocable'valves in said valve chest bores, and gearing operatively -connecting said crank shaft and said spindle for driving the spindle in either direction.

'.7. `ln a drilling machine, in combination with a casing, a spindle mounted in one end of thecasing, an engine comprising a pair of cylinders in the other end of said casing, said cylinders being located in two diierent planes which intersect at an acute angle in a line'at -rightangles to the axis of said spindle, a valve chest parallel with and sociated with each cylinder, a piston in each cylinder and a valve reciprocable in each valve chest, a crank shait mounted in the casingl with its axis parallel to the line in which the planes yof the cylindersintersect, said crank shaft havingl oppositely disposed crank pins and oppositely disposed eccentrics, the diameters of whichvare arranged at right angles to the diameter of said crank pins, each crank pin being operatively con nected to and associated with one of said, pistons, and each eccentric being operatively connected to and associated with one or' said reciprocable valves in said valve chest bores,

ent planes which intersect at an acute angle in aline at right angles to the axes of said spindle. a valve chest parallel with and associ ated with each cylinder, a piston ineach cylinder and a valve reciprocable in each valve chest, a crank shaft Vmounted in the casing` with its axis parallel to the line in which the planes of the cylinders intersectN said crank shaft having oppositely disposed crank pins and oppositely disposed eccentrics, the diameters of which are arranged at yright angles to the diameter of said crank pins, each crank pin being operatively connected to and associated with one oi' saidpistons, and each eccentric being operatively connected to and associated with one ot said reciprocable valves-in said valve chest bores,V

an intermediary valve plug having an inlet passage and an exhaust passage, each of which are adapted to be connected by said reciprocable valve with said cylinders, and a throttle valve havingan inlet and an ei;- liaust port adapted to connect either oi' the passages in the intermediary valve plug in alternation *with said inlet and exhaust port respectively. n

9. ik drilling machine comprising an clone ted casino)` having a pair of cylinder bores n one end of said casing7 said cylinder bores beinglocated in different planeswhich converge toward the other end of the casing and intersect in the transverse median plane oiE said casing; said casing` end also having :i valve chest bore parallel with and associated with each cylinder here, said associated cylinder bores and valve chest bores having which Vconnect thev valve v chest cra-nk "pins and* vopp'ositely vdisposedv eccentrics, the diainetersoi which are 'arranged at 'right angles to the diameters oi said crank pins, means operatively connect-- ing,` the piston with the crank pins, means operatively connecting,` the piston valves with the eccentrics, a spindle journaled in the other end of the casing, and operatively driven from the crank shaft, andl a valve plug located in the passageway connecting saidA valve'chest bores orcontrolling thehinlet and discharge oi' pressure iuid into and from said valve chest bores.

l0. A drilling machine comprising` y an elongated casing` having a pair of cylinder bores, in one end of sai-d casing, said cylinf der bores being located in different planes which converge toward the other end of the casing; and intersect in the transverse median plane of said casing, said casing end also` having a valve chest bore parallel with and associated with each cylinder bore, said as# sociated cylinder bores and valve chest bores having connecting passaoeways? there being passageways which connect the valve chest bores together, pistons and piston valves in said cylinder and valve ychest' bores vrespectively, avcrank shaft journaled in the casing,

said crank shaft having oppositely disposedlk crank pins and oppositely disposed` eccenl tries, they diameters of which are arranged at right angles to the diameter 'of said crank pins, means operatively connecting the piston with they crank pinsv means operatively connecting the piston valves with the eccen tries, a spindle gournaled in the other end ot the casing, and operatively driven frein the crankshaft, a Vvalve plug located in the passageway connecting saidl valve `chest bores, said valve plugr having inlet and ei:- haust passageways whichy communicate with the passageways connectin said valve chestv hores, and a valve sleeve associated ywith said valve plug for controlling the admis# rn of an operating' fluid into and out Vot.

said passageways in said valve plug.

. llfln a pneumatically drivenmachine, a

body7 a driven member rotatively mounted in the body, a crank shaft operatively connected with said driven member to drive it rin either direction said crank shaft having its axis extending at right angles to said driven member, diametrically opposite crank pins on said crank shaft and diainetrically opposite eccentrics on said crank shatt,'the common diameter of said eccentrics being at right angles to the common diameter of said crank pins7 and a double acting, twocylinder motor unit, said cylinders being arranged with their central axes in planes inas our invention We allix our signatures in J0 tersectng at an acute angle, each cylinder the presence of tWO Witnesses, this 12th day having a parallel, associated valve chest of MayA. D. 1916.

bore, a piston in each cylinder bore, a piston M ATHEW J BURKEL valve in each valve chest bore, and connectvPAUL B WE'IS ing rods connecting each piston and each piston valve with the associated crank pin VVtnesses:

and associated eccentric. LoUIs P. FosNor, In testimony7 that We claim the foregoing T. H. ALFREDs. 

